Pin cam deflector nut

ABSTRACT

The present disclosure generally relates to extrusion die systems. In particular, the present disclosure relates to a specialty pin cam nut designed for the ease of assembly and disassembly of extrusion dies.

FIELD

The present disclosure generally relates to extrusion die systems. Inparticular, the present disclosure relates to a specialty pin cam nutdesigned for the ease of assembly and disassembly of extrusion dies.

BACKGROUND

Extrusion is the pressurized processing of molten material through a dieto form the material into a specific shape. Extrusion dies can rangefrom the very simple designs such as a hole through a piece of metal tocomplex assemblies involving multiple components including deflectorswhich help to form the plastic into the desired shape. The process ofassembling or disassembling complex dies can often be time consuming foran extrusion line operator. There are a number of reasons whydisassembly and reassembly of a die may occur including maintenance,cleaning or a tooling change. The time required for assembly anddisassembly can have an effect on the up time of an extrusion line andtherefore productivity. As such, die assemblies should be manufacturedin a way to minimize the amount of down time.

Assembly and disassembly often involves the use of large diameterthreaded components and/or bolts to fasten components together. Whilethese are effective methods of fastening, they are also relatively timeconsuming as each threaded component or bolt requires multiple turns tofasten or remove which can often be a struggle if material in the die isacting as to adhere components to each other.

SUMMARY

The aspects of the disclosed embodiments provide a means of fasteningdie components in a manner that improves efficiency and product yieldwhile minimizing time and effort for die assembly and disassembly. A camnut works such that upon rotation in one direction one or more shortlength helical surfaces will move along pins or machined featurestightening the nut to the other component. If the nut is rotated in theopposite direction, the cam nut will loosen until can it be removed andoptionally upon further rotation hits another helical surface upon whichfurther rotation will force removal. This nut can be attached to or beintegrated into many different die components which may need to befastened to or removed from other components. Components the cam nut canbe used to fasten or remove include but are not limited to deflectors,tips and dies. Many die assemblies contain a die body which acts as theprimary component which houses other die components or to which othercomponents are attached to. The die body will typically be what the camnut attaches to. However, the cam nut could also be retained by the bodyand be rotated to attach to other components. The cam nut can bedesigned to attach internally to the body or be made to attachexternally to the die body. The cam nut can be turned or actuated byhandles, a separate tool, a motor or other means of rotation.

In one embodiment, the aspects of the disclosed embodiments are directedto a device comprising:

a first extrusion die subassembly containing a pitched groove;

a second extrusion die subassembly mated and aligned to the firstextrusion die subassembly containing a pin;

said first subassembly pitched groove angled such that the secondsubassembly pin will align to said first extrusion die subassemblypitched groove such that fully tightening second subassembly in underone rotation in one direction, and fully loosening said secondsubassembly in under one rotation in the opposite direction.

Another embodiment relates to a device designed such that when rotatedin the loosening direction will eject the first component or subassemblyand third component or subassembly from the second component orsubassembly or such that when rotated in the loosening direction willeject the second component or subassembly from the first component orsubassembly and third component or subassembly. This device could alsocontain a spring.

The aspects of the disclosed embodiments also relate to a method offastening multiple extrusion die subassemblies in which a firstsubassembly is fully fastened or fully loosened from a secondsubassembly by under one (a fractional) rotation of one or more of saidsubassemblies.

Another embodiment relates to a method in which continued rotation inthe loosening direction will eject one assembly from another.

Another embodiment relates to a method in which a first subassembly isfastened to a second subassembly resulting in a third component orsubassembly being retained.

Another embodiment relates to a method in which a spring is compressedduring the tightening of the device.

Another embodiment relates to a method in which the first subassemblyattaches to an external surface of the second subassembly.

Another embodiment relates to a method in which the first subassemblyattaches to an internal surface of the second subassembly. The presentinvention also relates to a method of fastening multiple extrusion diesubassemblies in which a first subassembly is fully fastened or fullyloosened from a second subassembly by under one rotation of one or moreof said subassemblies.

Another embodiment relates to a method in which continued rotation inthe loosening direction will eject one assembly from another.

Another embodiment relates to a method in which a first subassembly isfastened to a second subassembly resulting in a third component orsubassembly being retained.

Another embodiment relates to a method in which a spring is compressedduring the tightening of the device.

Another embodiment relates to a method in which the first subassemblyattaches to an external surface of the second subassembly.

Another embodiment relates to a method in which the first subassemblyattaches to an internal surface of the second subassembly. The presentinvention also relates to a method of fastening multiple extrusion diesubassemblies in which a first subassembly is fully fastened or fullyloosened from a second subassembly by under one rotation of one or moreof said subassemblies.

Another embodiment relates to a method in which continued rotation inthe loosening direction will eject one assembly from another.

Another embodiment relates to a method in which a first subassembly isfastened to a second subassembly resulting in a third component orsubassembly being retained.

Another embodiment relates to a method in which a spring is compressedduring the tightening of the device.

Another embodiment relates to a method in which the first subassemblyattaches to an external surface of the second subassembly.

Another embodiment relates to a method in which the first subassemblyattaches to an internal surface of the second subassembly. The presentinvention also relates to a method of fastening multiple extrusion diesubassemblies in which a first subassembly is fully fastened or fullyloosened from a second subassembly by under one rotation of one or moreof said subassemblies.

Another embodiment relates to a method in which continued rotation inthe loosening direction will eject one assembly from another.

Another embodiment relates to a method in which a first subassembly isfastened to a second subassembly resulting in a third component orsubassembly being retained.

Another embodiment relates to a method in which a spring is compressedduring the tightening of the device.

Another embodiment relates to a method in which the first subassemblyattaches to an external surface of the second subassembly.

Another embodiment relates to a method in which the first subassemblyattaches to an internal surface of the second subassembly.

These and other aspects and advantages of the exemplary embodiments willbecome apparent from the following detailed description considered inconjunction with the accompanying drawings. It is to be understood,however, that the drawings are designed solely for purposes ofillustration and not as a definition of the limits of the invention, forwhich reference should be made to the appended claims. Additionalaspects and advantages of the invention will be set forth in thedescription that follows, and in part will be obvious from thedescription, or may be learned by practice of the invention. Moreover,the aspects and advantages of the invention may be realized and obtainedby means of the instrumentalities and combinations particularly pointedout in the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings illustrate presently preferred embodiments ofthe present disclosure, and together with the general description givenabove and the detailed description given below, serve to explain theprinciples of the present disclosure. As shown throughout the drawings,like reference numerals designate like or corresponding parts.

FIG. 1 shows an example die body with pins protruding internally whichwould house and attach internally to the cam nut and deflector shown inFIG. 2.

FIG. 2 shows an example cam nut with an attached deflector.

FIG. 3 shows an example cross section showing how a cam nut can beattached to a deflector.

FIG. 4(a) shows the first step of assembly involves sliding the cam nuttowards the pin such that it is roughly aligned with surface 1.

FIG. 4(b) The second step involves rotating the cam nut such that thepin slides along surface 1 tightening the assembly.

FIGS. 5(a)-(b) demonstrate the disassembly process to using the cam nut.

FIG. 6 shows an example external cam nut which would attach to theoutside of another die component.

FIG. 7 shows an example die body with machined features on it externalsurface which will fasten to the corresponding features with a cam nut

FIG. 8 shows a cross section of a die assembly showing how thesecomponents look assembled.

FIG. 9 shows how a cam nut subassembly can be attached to a die body.

FIG. 10 shows the cross section of the die assembly and shows how thelatch pins will hook onto the machined features of the die body whichcan be seen in FIG. 11.

FIG. 11 shows the machined features of the die body which hook ontolatch pins shown in FIG. 10.

DETAILED DESCRIPTION

The aspects of the disclosed embodiments involve at least twocomponents; the component that is being fastened while attached to thecam nut and the component which contains pins or machined features thatthe cam nut is attaching to. The cam nut can be designed to attach tothe interior surface of a component or to an exterior surface. Also thecam nut and its mating component could have their features switched toperform the same fastening and disassembly functions. For instance thecam nut could contain the pins or other machined feature while themating component would contain the cam design which allows fortightening and optionally rapid removal. FIG. 1 shows an example diebody with pins protruding internally which would house and attachinternally to the cam nut and deflector shown in FIG. 2.

Depending on the component and if the cam nut has a secondary surfacefor rapid removal, a third component may be necessary to allow forrotation of the cam nut without rotation of the deflector, die, tip, orother primary die component. In FIG. 3, a retainer component is threadedonto a deflector and acts to lock the cam nut from sliding off thedeflector while allowing the cam nut to move rotationally as thedeflector remains stationary.

FIGS. 4(a)-(b) demonstrate the fastening process to use an internalversion of the cam nut. The cam nut fastening process begins withsliding the cam nut and attached components forward into the pin orlocking feature bearing component such that the pin or feature roughlyaligns with Surface 1. Using tools such as handles, wrenches, or motors,the cam nut is rotated such that the pin or locking feature slide alongthe pitched Surface 1 forcing the nut and associated components forwarduntil the nut is sufficiently tightened.

FIGS. 5(a)-(b) demonstrate the disassembly process to using the cam nut.The cam nut disassembly process begins with rotating the cam nut withtools such as handles, wrench or spanner wrenches such that the pin orlocking feature slides along the pitched Surface 1 pushing the cam backfrom the feature and loosening the nut. The second step involves furtherrotating the cam nut such that the pin slides along the highly pitchedSurface 2 rapidly forcing and removing the cam nut and attachedcomponents from the pin or locking feature bearing component.

In another example the cam nut can attach to the external portion of acomponent. In this case, the cam nut can also have a pitched surface fortightening as well as highly pitched surface for rapid extraction. FIG.6 shows an example external cam nut which would attach to the outside ofanother die component. FIG. 7 shows an example die body with machinedfeatures which will fasten to the corresponding features shown in FIG.6. FIG. 8 shows a cross section of a die assembly and how thesecomponents look assembled.

In this example, the cam nut in FIG. 6 will tighten as Surface 1 slidesalong Surface 1 of the die body in FIG. 7. As it slides along it will bedriving forward a die component, or in this case the deflector in FIG.8, which is what will cause the pressure between the Surface 1 on thecam nut and Surface 1 on the die body. This pressure is caused becauseas the deflector is driven forward by the cam nut at the drivingsurface, the deflector's sealing surface meets with the die body. Inthis example, the cam nut can also rotate without rotating the deflectoras it assembles over the deflector via keys and keyways as seen in FIGS.6 and 8. During disassembly, a the cam nut is rotated such that itloosens, Surface 2 of the cam nut and Surface 2 on the die body willdrive the cam nut from the die body quickly due to its high pitch. Thecam nut will pull the deflector back for removal with it as the keys onthe deflector will contact with the cam nut.

The examples so far have been chosen to illustrate the differencebetween an internal version of the cam nut and an external version. Alsothe first example uses pins while the second example uses featuresmachined onto the die body. There are many variations feasible toaccomplish the task set out by use of the cam nut and should beconsidered obvious. These include but are not limited variation in thenumber of cam features on the nut and corresponding component. In bothexamples there were three cam features but the cam could be designed tohave one or more. Other variations include the degree of pitch of thesurfaces as well as the number of pitches of the surfaces machined onthe cam nut. Another variation would be one such that the cam nut isretained by the die body while allowing it to rotate. The cam nut couldthen be used to fasten or remove die components to or from the body. Anytools or means of rotating the cam nut along with features required fortheir use should be considered obvious and encompassed in the scope ofthis invention.

Another variation of this device involves the use of a spring or springsin conjunction with the cam nut to apply pressure to attachedcomponents. There are various ways to incorporate a spring or springs inthis manner. The spring could be one of many varieties including but notlimited to Belleville washers and coiled springs. The spring could beintegrated into the cam nut or die body or be assembled to eithercomponent. In the following example, the spring is attached to anexternal version of the cam nut with a retaining plate, pins and latchpins to form a cam nut subassembly. A cam nut subassembly can be seenattached to a die body in FIG. 9. The spring is sandwiched between thecam nut and the retaining plate while the latch pins are pinned toconstrain the retaining plate. A sub assembly can be understood as acombination of components which when assembled can be viewed as singlecomponent of another assembly.

The cam nut subassembly including a spring may function similarly to theprevious examples. FIG. 10 shows the cross section of the die assemblyand shows how the latch pins will hook onto the machined features of thedie body which can be seen in FIG. 11. The hooks of the latch pins willride along the pitched surface 1 during assembly until it turns into theslot which does not have a pitch. While this occurs, the spring is beingcompressed as it forces another component forward. In this case thecomponent would be a deflector which is not shown in the figures. Theslot without a pitch allows for a maximum compression of the spring andcould prevent over tightening. The slot could also be pitched however toallow for more refined tightening. The use of a spring could also serveas a safety measure because if there was an over pressure conditioninside the head, the spring may compress further to relieve some of thispressure. The cam nut subassembly would function similar to the otherexamples during disassembly as the latch pin's hook will ride alongsurface 2 resulting in rapid removal as the cam nut is rotated.

Thus, while there have been shown, described and pointed out,fundamental novel features of the invention as applied to the exemplaryembodiments thereof, it will be understood that various omissions,substitutions and changes in the form and details of devices and methodsillustrated, and in their operation, may be made by those skilled in theart without departing from the spirit and scope of the presentlydisclosed invention. Further, it is expressly intended that allcombinations of those elements, which perform substantially the samefunction in substantially the same way to achieve the same results, arewithin the scope of the invention. Moreover, it should be recognizedthat structures and/or elements shown and/or described in connectionwith any disclosed form or embodiment of the invention may beincorporated in any other disclosed or described or suggested form orembodiment as a general matter of design choice. It is the intention,therefore, to be limited only as indicated by the scope of the claimsappended hereto.

The invention claimed is:
 1. A device comprising: a first extrusion diesubassembly including a pitched groove and a first sealing surface; asecond extrusion die subassembly including a pin and a second sealingsurface, wherein said second extrusion die subassembly is mated to andaligned with the first extrusion die subassembly with the pin of thesecond extrusion die subassembly engaged in the pitched groove of thefirst extrusion die subassembly; the first extrusion die subassembly orsecond extrusion die assembly further including a deflector and furtherincluding a flow passage positioned adjacent the sealing surface of theextrusion die subassembly on which the flow passage is positioned,wherein the pitched groove is angled such that the pin will align withthe pitched groove and such that the first extrusion die subassembly canbe tightened or loosened from the second extrusion die subassembly inunder one rotation of one or more of said extrusion die subassembliesand the fastening direction creates a sealing pressure between the firstsealing surface and the second sealing surface confining flow throughthe flow passage and the loosening direction applies an ejectionpressure.
 2. The device according to claim 1 wherein said secondextrusion die subassembly will eject said first extrusion diesubassembly from said second extrusion die subassembly when rotated inthe loosening direction.
 3. The device according to claim 1 in which aspring operably linked to the first extrusion die subassembly iscompressed during the tightening of the device.
 4. The device accordingto claim 1 in which the first extrusion die subassembly attaches to anexternal surface of the second extrusion die subassembly.
 5. The deviceaccording to claim 1 in which the first extrusion die subassemblyattaches to an internal surface of the second extrusion die subassembly.